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\PY{c+c1}{// public domain}
\PY{k+kn}{package}\PY{+w}{ }\PY{n+nx}{hello\PYZus{}life}

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\PY{+w}{	}\PY{n+nx}{cells1}\PY{+w}{ }\PY{p}{:}\PY{+w}{ }\PY{k+kd}{map}\PY{p}{[}\PY{p}{[}\PY{l+m+mi}{2}\PY{p}{]}\PY{n+nx}{i32}\PY{p}{]}\PY{k+kt}{bool}
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\PY{c+cm}{/* initial state:}
\PY{c+cm}{	****}
\PY{c+cm}{	 *}
\PY{c+cm}{	  *}
\PY{c+cm}{	  *}
\PY{c+cm}{*/}
\PY{+w}{	}\PY{n+nx}{cellsfront}\PY{p}{[}\PY{p}{\PYZob{}}\PY{l+m+mi}{0}\PY{o}{+}\PY{n+nx}{texture}\PY{p}{.}\PY{n+nx}{w}\PY{o}{/}\PY{l+m+mi}{2}\PY{p}{,}\PY{+w}{ }\PY{l+m+mi}{0}\PY{o}{+}\PY{n+nx}{texture}\PY{p}{.}\PY{n+nx}{h}\PY{o}{/}\PY{l+m+mi}{2}\PY{p}{\PYZcb{}}\PY{p}{]}\PY{+w}{ }\PY{p}{=}\PY{+w}{ }\PY{k+kc}{true}
\PY{+w}{	}\PY{n+nx}{cellsfront}\PY{p}{[}\PY{p}{\PYZob{}}\PY{l+m+mi}{1}\PY{o}{+}\PY{n+nx}{texture}\PY{p}{.}\PY{n+nx}{w}\PY{o}{/}\PY{l+m+mi}{2}\PY{p}{,}\PY{+w}{ }\PY{l+m+mi}{0}\PY{o}{+}\PY{n+nx}{texture}\PY{p}{.}\PY{n+nx}{h}\PY{o}{/}\PY{l+m+mi}{2}\PY{p}{\PYZcb{}}\PY{p}{]}\PY{+w}{ }\PY{p}{=}\PY{+w}{ }\PY{k+kc}{true}
\PY{+w}{	}\PY{n+nx}{cellsfront}\PY{p}{[}\PY{p}{\PYZob{}}\PY{l+m+mi}{2}\PY{o}{+}\PY{n+nx}{texture}\PY{p}{.}\PY{n+nx}{w}\PY{o}{/}\PY{l+m+mi}{2}\PY{p}{,}\PY{+w}{ }\PY{l+m+mi}{0}\PY{o}{+}\PY{n+nx}{texture}\PY{p}{.}\PY{n+nx}{h}\PY{o}{/}\PY{l+m+mi}{2}\PY{p}{\PYZcb{}}\PY{p}{]}\PY{+w}{ }\PY{p}{=}\PY{+w}{ }\PY{k+kc}{true}
\PY{+w}{	}\PY{n+nx}{cellsfront}\PY{p}{[}\PY{p}{\PYZob{}}\PY{l+m+mi}{3}\PY{o}{+}\PY{n+nx}{texture}\PY{p}{.}\PY{n+nx}{w}\PY{o}{/}\PY{l+m+mi}{2}\PY{p}{,}\PY{+w}{ }\PY{l+m+mi}{0}\PY{o}{+}\PY{n+nx}{texture}\PY{p}{.}\PY{n+nx}{h}\PY{o}{/}\PY{l+m+mi}{2}\PY{p}{\PYZcb{}}\PY{p}{]}\PY{+w}{ }\PY{p}{=}\PY{+w}{ }\PY{k+kc}{true}
\PY{+w}{	}\PY{n+nx}{cellsfront}\PY{p}{[}\PY{p}{\PYZob{}}\PY{l+m+mi}{1}\PY{o}{+}\PY{n+nx}{texture}\PY{p}{.}\PY{n+nx}{w}\PY{o}{/}\PY{l+m+mi}{2}\PY{p}{,}\PY{+w}{ }\PY{l+m+mi}{1}\PY{o}{+}\PY{n+nx}{texture}\PY{p}{.}\PY{n+nx}{h}\PY{o}{/}\PY{l+m+mi}{2}\PY{p}{\PYZcb{}}\PY{p}{]}\PY{+w}{ }\PY{p}{=}\PY{+w}{ }\PY{k+kc}{true}
\PY{+w}{	}\PY{n+nx}{cellsfront}\PY{p}{[}\PY{p}{\PYZob{}}\PY{l+m+mi}{2}\PY{o}{+}\PY{n+nx}{texture}\PY{p}{.}\PY{n+nx}{w}\PY{o}{/}\PY{l+m+mi}{2}\PY{p}{,}\PY{+w}{ }\PY{l+m+mi}{2}\PY{o}{+}\PY{n+nx}{texture}\PY{p}{.}\PY{n+nx}{h}\PY{o}{/}\PY{l+m+mi}{2}\PY{p}{\PYZcb{}}\PY{p}{]}\PY{+w}{ }\PY{p}{=}\PY{+w}{ }\PY{k+kc}{true}
\PY{+w}{	}\PY{n+nx}{cellsfront}\PY{p}{[}\PY{p}{\PYZob{}}\PY{l+m+mi}{2}\PY{o}{+}\PY{n+nx}{texture}\PY{p}{.}\PY{n+nx}{w}\PY{o}{/}\PY{l+m+mi}{2}\PY{p}{,}\PY{+w}{ }\PY{l+m+mi}{3}\PY{o}{+}\PY{n+nx}{texture}\PY{p}{.}\PY{n+nx}{h}\PY{o}{/}\PY{l+m+mi}{2}\PY{p}{\PYZcb{}}\PY{p}{]}\PY{+w}{ }\PY{p}{=}\PY{+w}{ }\PY{k+kc}{true}

\PY{+w}{	}\PY{n+nx}{running}\PY{+w}{ }\PY{p}{:}\PY{+w}{ }\PY{k+kt}{bool}\PY{+w}{ }\PY{p}{=}\PY{+w}{ }\PY{k+kc}{true}
\PY{+w}{	}\PY{n+nx}{time\PYZus{}start}\PY{+w}{ }\PY{p}{:}\PY{+w}{ }\PY{n+nx}{u64}
\PY{+w}{	}\PY{n+nx}{loop}\PY{p}{:}\PY{+w}{ }\PY{k}{for}\PY{+w}{ }\PY{n+nx}{running}\PY{+w}{ }\PY{p}{\PYZob{}}
\PY{+w}{		}\PY{n+nx}{time\PYZus{}start}\PY{+w}{ }\PY{p}{=}\PY{+w}{ }\PY{n+nx}{sdl}\PY{p}{.}\PY{n+nx}{GetTicksNS}\PY{p}{(}\PY{p}{)}
\PY{+w}{		}\PY{n+nx}{event}\PY{+w}{ }\PY{p}{:}\PY{+w}{ }\PY{n+nx}{sdl}\PY{p}{.}\PY{n+nx}{Event}
\PY{+w}{		}\PY{n+nx}{result}\PY{+w}{ }\PY{p}{=}\PY{+w}{ }\PY{n+nx}{sdl}\PY{p}{.}\PY{n+nx}{PollEvent}\PY{p}{(}\PY{o}{\PYZam{}}\PY{n+nx}{event}\PY{p}{)}
\PY{+w}{		}\PY{err}{\PYZsh{}}\PY{n+nx}{partial}\PY{+w}{ }\PY{k}{switch}\PY{+w}{ }\PY{n+nx}{event}\PY{p}{.}\PY{k+kd}{type}\PY{+w}{ }\PY{p}{\PYZob{}}
\PY{+w}{			}\PY{k}{case}\PY{+w}{ }\PY{p}{.}\PY{n+nx}{QUIT}\PY{p}{:}
\PY{+w}{			}\PY{n+nx}{running}\PY{+w}{ }\PY{p}{=}\PY{+w}{ }\PY{k+kc}{false}
\PY{+w}{			}\PY{k}{break}\PY{+w}{ }\PY{n+nx}{loop}
\PY{+w}{		}\PY{p}{\PYZcb{}}

\PY{+w}{		}\PY{n+nx}{pixels\PYZus{}rawptr}\PY{+w}{ }\PY{p}{:}\PY{+w}{ }\PY{n+nx}{rawptr}
\PY{+w}{		}\PY{n+nx}{pitch}\PY{+w}{ }\PY{p}{:}\PY{+w}{ }\PY{n+nx}{i32}
\PY{+w}{		}\PY{n+nx}{sdl}\PY{p}{.}\PY{n+nx}{LockTexture}\PY{p}{(}\PY{n+nx}{texture}\PY{p}{,}\PY{+w}{ }\PY{k+kc}{nil}\PY{p}{,}\PY{+w}{ }\PY{o}{\PYZam{}}\PY{n+nx}{pixels\PYZus{}rawptr}\PY{p}{,}\PY{+w}{ }\PY{o}{\PYZam{}}\PY{n+nx}{pitch}\PY{p}{)}
\PY{+w}{		}\PY{n+nx}{pixels}\PY{+w}{ }\PY{o}{:=}\PY{+w}{ }\PY{p}{(}\PY{p}{[}\PY{p}{\PYZca{}}\PY{p}{]}\PY{p}{[}\PY{l+m+mi}{4}\PY{p}{]}\PY{n+nx}{u8}\PY{p}{)}\PY{p}{(}\PY{n+nx}{pixels\PYZus{}rawptr}\PY{p}{)}\PY{p}{[}\PY{p}{:}\PY{n+nx}{texture}\PY{p}{.}\PY{n+nx}{w}\PY{+w}{ }\PY{o}{*}\PY{+w}{ }\PY{n+nx}{texture}\PY{p}{.}\PY{n+nx}{h}\PY{p}{]}
\PY{+w}{		}\PY{n+nx}{ClearBoard}\PY{p}{(}\PY{n+nx}{pixels}\PY{p}{,}\PY{+w}{ }\PY{p}{\PYZob{}}\PY{l+m+mi}{200}\PY{p}{,}\PY{+w}{ }\PY{l+m+mi}{200}\PY{p}{,}\PY{+w}{ }\PY{l+m+mi}{200}\PY{p}{,}\PY{+w}{ }\PY{l+m+mi}{255}\PY{p}{\PYZcb{}}\PY{p}{)}
\PY{+w}{		}\PY{n+nx}{DrawCells}\PY{p}{(}\PY{n+nx}{cellsfront}\PY{p}{,}\PY{+w}{ }\PY{n+nx}{pixels}\PY{p}{,}\PY{+w}{ }\PY{p}{\PYZob{}}\PY{l+m+mi}{0}\PY{p}{,}\PY{+w}{ }\PY{l+m+mi}{0}\PY{p}{,}\PY{+w}{ }\PY{l+m+mi}{255}\PY{p}{,}\PY{+w}{ }\PY{l+m+mi}{255}\PY{p}{\PYZcb{}}\PY{p}{,}\PY{+w}{ }\PY{n+nx}{texture}\PY{p}{.}\PY{n+nx}{w}\PY{p}{,}\PY{+w}{ }\PY{n+nx}{texture}\PY{p}{.}\PY{n+nx}{h}\PY{p}{)}
\PY{+w}{		}\PY{n+nx}{sdl}\PY{p}{.}\PY{n+nx}{UnlockTexture}\PY{p}{(}\PY{n+nx}{texture}\PY{p}{)}
\PY{+w}{		}\PY{n+nx}{sdl}\PY{p}{.}\PY{n+nx}{RenderClear}\PY{p}{(}\PY{n+nx}{renderer}\PY{p}{)}
\PY{+w}{		}\PY{n+nx}{sdl}\PY{p}{.}\PY{n+nx}{RenderTexture}\PY{p}{(}\PY{n+nx}{renderer}\PY{p}{,}\PY{+w}{ }\PY{n+nx}{texture}\PY{p}{,}\PY{+w}{ }\PY{k+kc}{nil}\PY{p}{,}\PY{+w}{ }\PY{k+kc}{nil}\PY{p}{)}
\PY{+w}{		}\PY{n+nx}{sdl}\PY{p}{.}\PY{n+nx}{RenderPresent}\PY{p}{(}\PY{n+nx}{renderer}\PY{p}{)}

\PY{+w}{		}\PY{n+nx}{ComputeLife}\PY{p}{(}\PY{n+nx}{cellsfront}\PY{p}{,}\PY{+w}{ }\PY{n+nx}{cellsback}\PY{p}{)}
\PY{+w}{		}\PY{n+nx}{cellsfront}\PY{p}{,}\PY{+w}{ }\PY{n+nx}{cellsback}\PY{+w}{ }\PY{p}{=}\PY{+w}{ }\PY{n+nx}{cellsback}\PY{p}{,}\PY{+w}{ }\PY{n+nx}{cellsfront}

\PY{+w}{		}\PY{n+nx}{time\PYZus{}end}\PY{+w}{ }\PY{o}{:=}\PY{+w}{ }\PY{n+nx}{sdl}\PY{p}{.}\PY{n+nx}{GetTicksNS}\PY{p}{(}\PY{p}{)}
\PY{+w}{		}\PY{c+c1}{// do more generations but maintain the target fps}
\PY{+w}{		}\PY{k}{for}\PY{+w}{ }\PY{n+nx}{time\PYZus{}end}\PY{+w}{ }\PY{o}{\PYZhy{}}\PY{+w}{ }\PY{n+nx}{time\PYZus{}start}\PY{+w}{ }\PY{p}{\PYZlt{}}\PY{+w}{ }\PY{l+m+mf}{1e9}\PY{o}{/}\PY{l+m+mi}{30}\PY{+w}{ }\PY{p}{\PYZob{}}
\PY{+w}{			}\PY{n+nx}{ComputeLife}\PY{p}{(}\PY{n+nx}{cellsfront}\PY{p}{,}\PY{+w}{ }\PY{n+nx}{cellsback}\PY{p}{)}
\PY{+w}{			}\PY{n+nx}{cellsfront}\PY{p}{,}\PY{+w}{ }\PY{n+nx}{cellsback}\PY{+w}{ }\PY{p}{=}\PY{+w}{ }\PY{n+nx}{cellsback}\PY{p}{,}\PY{+w}{ }\PY{n+nx}{cellsfront}
\PY{+w}{			}\PY{c+c1}{// also handle events so the window doesn\PYZsq{}t lag}
\PY{+w}{			}\PY{n+nx}{result}\PY{+w}{ }\PY{p}{=}\PY{+w}{ }\PY{n+nx}{sdl}\PY{p}{.}\PY{n+nx}{PollEvent}\PY{p}{(}\PY{o}{\PYZam{}}\PY{n+nx}{event}\PY{p}{)}
\PY{+w}{			}\PY{err}{\PYZsh{}}\PY{n+nx}{partial}\PY{+w}{ }\PY{k}{switch}\PY{+w}{ }\PY{n+nx}{event}\PY{p}{.}\PY{k+kd}{type}\PY{+w}{ }\PY{p}{\PYZob{}}
\PY{+w}{				}\PY{k}{case}\PY{+w}{ }\PY{p}{.}\PY{n+nx}{QUIT}\PY{p}{:}
\PY{+w}{				}\PY{n+nx}{running}\PY{+w}{ }\PY{p}{=}\PY{+w}{ }\PY{k+kc}{false}
\PY{+w}{				}\PY{k}{break}\PY{+w}{ }\PY{n+nx}{loop}
\PY{+w}{			}\PY{p}{\PYZcb{}}
\PY{+w}{			}\PY{n+nx}{time\PYZus{}end}\PY{+w}{ }\PY{p}{=}\PY{+w}{ }\PY{n+nx}{sdl}\PY{p}{.}\PY{n+nx}{GetTicksNS}\PY{p}{(}\PY{p}{)}
\PY{+w}{		}\PY{p}{\PYZcb{}}
\PY{+w}{	}\PY{p}{\PYZcb{}}

\PY{+w}{	}\PY{n+nx}{sdl}\PY{p}{.}\PY{n+nx}{DestroyRenderer}\PY{p}{(}\PY{n+nx}{renderer}\PY{p}{)}
\PY{+w}{	}\PY{n+nx}{sdl}\PY{p}{.}\PY{n+nx}{DestroyWindow}\PY{p}{(}\PY{n+nx}{window}\PY{p}{)}
\PY{+w}{	}\PY{n+nx}{sdl}\PY{p}{.}\PY{n+nx}{Quit}\PY{p}{(}\PY{p}{)}
\PY{p}{\PYZcb{}}
\end{Verbatim}